The Effect of Growth Rate on the Microstructure and Mechanical Properties of 7020 Alloys

Kaya H., Büyük U., Cadirli E., Sahin M., Gündüz M.

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, cilt.31, sa.2, ss.1622-1630, 2022 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 31 Sayı: 2
  • Basım Tarihi: 2022
  • Doi Numarası: 10.1007/s11665-021-06298-8
  • Dergi Adı: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED)
  • Sayfa Sayıları: ss.1622-1630
  • Anahtar Kelimeler: 7020 alloy, compressive yield strength, dendritic spacings, fracture surface analysis, microhardness, ultimate tensile strength
  • Erciyes Üniversitesi Adresli: Evet

Özet

The 7020 aluminum alloy is one of the hardenable Al-Zn-Mg based alloys, which are a family of high strength aluminum alloys. These 7020 alloys are commonly used in the aircraft and automotive industries. The microstructural changes have a significant impact on the mechanical properties of binary and multi-component alloys. For this reason, 7020 aluminum alloys were prepared with different growth rates on account of the changes in the microstructures; thus, directionally solidification processes were actualized with a Bridgman furnace at five various growth rates (V = 8.3-166.0 mu m/s) and at constant temperature gradient (G = 8.3 K/mm). Microhardness (HV), ultimate tensile strength (sigma(U)) and yield strength (sigma(y)) of the solidified alloys were determined. The HV increased from 758.8 to 917.1 N/mm(2), the sigma(U) from 125.4 to 208.1 N/mm(2) and the sigma(y) from 133.7 to 230.8 N/mm(2) with an increase in growth rate from 8.3 to 166.0 mu m/s.